1. You don't need calcium hardness in a vinyl pool. Period. Ever. Take it back, if you haven't used it.

2. Dealer testing is never reliable. CYA levels are critical, and strip-based testing for CYA is often wrong by a large margin.

3. Ignore acid testing, too. Is your pH OK. If so, the other bits -- alkalinity & calcium aren't critical.

4. . . . which is why you need to get a K2006, and test it your self. Amazon link for kit at good price is in signature

5. 22years on an AG pool? That's a great ad for Doughboy.